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. 2019 Jun 14;19:131. doi: 10.1186/s12906-019-2523-7

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Effect of acupuncture on the clinical pregnancy rates in women undergoing IVF. Villahermosa 2013 had one acupuncture group and two control groups (sham acupuncture group and no intervention control group), two control groups were grouped separately for relevant subgroup analysis, and when calculated the total pooled risk ratio (RR), we took them together